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Knock Sensor, Mercruiser 305, 350, 377 Quantity in Cart: None Part Number: MAL9-33503 Price: $49.95 Weight: 0.22 lbs Adjust Quantity: This is a Knock Sensor for Mercruiser Small Block V8It fits MCM/MIE 305, 350 and 377Replaces OEM: 806612T Categories MAL9-33503 is found in.Fuel Injection Parts for MercruiserFuel Injection Parts for Mercruiser Inboards Where Ignition Is Just The Start.